1. Alhazov, A., Ishdorj, T.O.: Membrane operations in P systems with active membranes. In: Proc. Second BWMC, TR 01/04, Sevilla University, pp. 37–44 (2004)
2. Bel Enguix, G., Jiménez-Lopez, M.D.: Linguistic membrane systems and applications. In: Applications of Membrane Computing, pp. 347–388. Springer, Heidelberg (2005)
3. Lecture Notes in Computer Science;D. Besozzi,2001
4. Csuhaj-Varjú, E., Di Nola, A., Păun, Gh., Peŕez-Jiménez, M.J. , Vaszil, G.: Editing configurations of P systems. In: Proc. 3rd BWMC, January 31- February 4, 2005, pp. 131–154 (2005)
5. Lecture Notes in Computer Science;S.N. Krishna,2005